#include<stdio.h>

int main(void)
{
	long long n;
	int times=0;
	scanf("%d",&n);
	while(n!=1)
	{
		if(n%2)
		{
			n=3*n+1;
		}
		else
		{
			n/=2;
		}
		times++;
	}
	
	printf("%d",times);
	
	return 0;
}
